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Subject: What size over run

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David    Posted 09-17-2019 at 10:51:54 [URL] [DELETE]        [Reply] [Email]  
  • What size over run
  • I need to know what size to buy for my 8n
    assuming it's stock
    1 1/8 or 1 3/8 really unsure

    Tim Daley(MI)    Posted 09-18-2019 at 07:27:35 [URL] [DELETE]        [Reply] [No Email]  
  • Re: What size over run
  • If you are going to run a manure spreader, brush hog, finish mower, or ay other implement that is driven by a PTO driveline you should invest in an ORC. You measure the PTO Splined Shaft with a 1"-2" mic or 6" dial or digital calipers. Measure the major diameter of the spline 180 apart. If you are good a scale will work. If using a plow, cultivator, or disc harrow for example one is not needed so you can simply use an adapter sleeve, about 1/4 the price of an ORC.

    1-1/8 to 1-3/8 sleeve adapter:


    Tim Daley(MI)

    Ultradig MN    Posted 09-18-2019 at 14:18:30 [URL] [DELETE]        [Reply] [No Email]  
  • Re: What size over run
  • Tim,
    I disagree with you somewhat here.
    He needs an ORC for a rotary mower and that is really the only pto driven implement that needs one.
    No other item has that massive inertia like a rotary mower does.
    Not a PHD, buzz saw, hay rake, sickle mower or manure spreader.
    Some say you need an orc on a finish mower but I never felt a need for one and ran a 6' FM behind an N for three years without one.
    Yes, when a fm is spun up you can feel a slight push when you depress the clutch but it was negligible compared to a brush mower. Like maybe 10% or so and very managable.
    Not trying to start an argument but I will try to keep the advice that is given here accurate.

    David    Posted 09-18-2019 at 18:21:43 [URL] [DELETE]        [Reply] [Email]  
  • Re: What size over run
  • I do agree with Utradig MN I have used my 8n without one with a 6' finish mower I just purchase and did not have the push that I have read about
    I do however feel the need for the over ride clutch just for extra bit of safety

    Ultradog MN    Posted 09-17-2019 at 17:15:56 [URL] [DELETE]        [Reply] [No Email]  
  • Re: What size over run
  • Do yourself a favor and if it isn't already 1 3/8" convert it. Everything nowdays is made to connect to a 1 3/8". Then buy a push button type ORC.
    They're Sooo much easier to put on and take off. Sooo much safer too.
    I always hated that orc spinning back there every time you wanted to use the 3 point. Yes, a guy can take the type with the roll pin off and on too but a guy gets lazy and thinks: "I'm just gonna use the boom pole for a couple of minutes to lift this log or engine or tire off the trailer."
    So you use it with that orc spinning and it's just unsafe as hell.
    Photo shows the good kind. They cost more but they're worth it IMO.

    David    Posted 09-17-2019 at 12:54:29 [URL] [DELETE]        [Reply] [Email]  
  • Re: What size over run
  • thanks
    I will measure before I buy one

    K.LaRue-VA    Posted 09-17-2019 at 12:34:39 [URL] [DELETE]        [Reply] [No Email]  
  • Re: What size over run
  • I wouldn't buy anything without measuring first. Original was 1-1/8" but many have been replaced with 1-3/8" shafts.

    All of mine came with a tight-fitting roll pin that was supposed to be hammered thru the shaft to hold them on. That pin makes the coupler much harder to remove. I replace my roll pins with a piece of mild steel round bar, or cut the head off an ungraded bolt that fits loose. I also replace the zerk fittings with flush allen head plugs. Stick one zerk in long enough to squirt grease in there. The grease zerks can get broken off or catch and wind stuff around the PTO shaft.

    Dead Eye Dave    Posted 09-17-2019 at 11:15:34 [URL] [DELETE]        [Reply] [No Email]  
  • Re: What size over run
  • Mine was originally 1 1/8". I bought an overrunning coupler in 1 3/8". So, 1 1/8" female on one end and 1 3/8" male on the exposed end. If you can find one which can be taken on and off easily that is a bonus instead of one of the permanently installed kind. Dave

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